用于航空航天应用的氟化聚酰亚胺/棕褐色真黑色素纳米复合材料,ACS Applied Polymer Materials

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用于航空航天应用的氟化聚酰亚胺/棕褐色真黑色素纳米复合材料
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-01-09 , DOI: 10.1021/acsapm.2c01999
Qing Li _{1,

2,

3} , Yujuan Guo ₂ , Shunmin Yi ₃ , Zushun Xu ₂ , Wengui Duan ₁ , Sheng Liu ₃

Affiliation

天然海洋棕褐色真黑色素衍生添加剂（ASE）被用作填料改性高氟化聚酰亚胺（FPI），通过化学键合和孔结构构建获得增强的综合性能。应力-应变曲线表明最佳拉伸强度为 108.25 MPa，断裂伸长率为 4.83%（1 wt% ASE），分别是纯 FPI 的 1.30 倍和 1.34 倍。热分析表明，T _g高达 360.1，比原始 FPI 高 14.4 °C。FPI/ASE 薄膜卓越的紫外线屏蔽能力已通过姜黄素光降解、耐久性等测量得到证实。FTIR 和 AFM 表现出优异的光稳定性，羰基吸收峰基本不变，并且在 UV 曝光 720 小时后表面粗糙度的变化要小得多。综上所述，FPI 和 ASE 之间的共价网络结构有助于提高机械性能和热性能。FPI 和 ASE 的协同紫外线吸收、光热转化和 ASE 的自由基捕获能力等机制是造成显着的紫外线屏蔽和光稳定性的原因。上述卓越的综合性能使FPI/ASE薄膜成为航空航天应用中紫外线屏蔽的候选材料。

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Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications

Natural marine sepia eumelanin-derived additives (ASE) were used as a filler to modify highly fluorinated polyimide (FPI), acquiring the enhanced comprehensive performance by chemical bonding and pore structure construction. Stress–strain curves indicated an optimal tensile strength of 108.25 MPa and a fracture elongation of 4.83% (1 wt % ASE), respectively, 1.30 and 1.34× that of pure FPI. Thermal analysis showed that T_g was as high as 360.1, 14.4 °C higher than that of pristine FPI. The exceptional UV-shielding capabilities of the FPI/ASE films were confirmed by measurements of curcumin photodegradation, durability, and so on. FTIR and AFM manifested their superior photostability with basically unchanged carbonyl absorption peaks and much less variation in surface roughness after UV exposure for 720 h. To sum up, the covalent network structure between FPI and ASE contributed to the improvement of mechanical and thermal properties. The mechanisms, such as synergistic UV absorption of FPI and ASE, photothermal conversion, and ASE’s free radical trapping ability, were responsible for the remarkable UV-shielding and light stability. The above remarkable comprehensive performance makes the FPI/ASE film a candidate for UV shielding in aerospace applications.

更新日期：2023-01-09

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